designing and installing streambank stabilization...
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Designing and Installing Designing and Installing Streambank Stabilization Practices Streambank Stabilization Practices
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Dr. Dennis C. ClarkeDr. Dennis C. ClarkeSouth DakotaSouth Dakota
Department of Environment and Natural ResourcesDepartment of Environment and Natural Resources
Joe Foss Building, 523 E. CapitolJoe Foss Building, 523 E. CapitolPierre, South Dakota 57501Pierre, South Dakota 57501--31823182
[email protected]@sd.state.us(605) 773(605) 773--42524252
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Practice OptionsPractice Options
Soft
HardHard
Combination
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Use of plants and plant materials (brush) and Use of plants and plant materials (brush) and engineered structures for slope protection and engineered structures for slope protection and erosion control.erosion control.
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By What NameBy What Name??
Soft PracticesSoft PracticesNonstructural PracticesNonstructural PracticesBiotechnicalBiotechnicalBioengineeringBioengineeringBiogeotechnicalBiogeotechnical
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ApplicationsApplications
Gully Erosion Gully Erosion Slope ProtectionSlope ProtectionLakeshore ProtectionLakeshore ProtectionStreambank/Riparian RestorationStreambank/Riparian Restoration
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General RulesGeneral Rules
Read NatureRead Nature–– What’s growing in the area?What’s growing in the area?–– Is it something that can or should be “fixed”?Is it something that can or should be “fixed”?
Never disturb a site unnecessarilyNever disturb a site unnecessarily–– Do no harm. Do no harm. –– If it ain’t broke don’t fix it!If it ain’t broke don’t fix it!
Remember Remember –– “Big plants come from little plants.”“Big plants come from little plants.”
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PlanningPlanningFit the system to the siteFit the system to the site–– Vegetation Vegetation –– HydrologyHydrology–– Geology and soilsGeology and soils–– Topography and exposureTopography and exposure
Limit removal of vegetationLimit removal of vegetationStockpile and protect top soil/materialsStockpile and protect top soil/materialsProtect exposed areas during constructionProtect exposed areas during constructionObtain required permits and clearancesObtain required permits and clearances–– 401/404401/404–– Storm Water Construction and DewateringStorm Water Construction and Dewatering–– Cultural and Historic ResourcesCultural and Historic Resources–– T & E SpeciesT & E Species
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Design ConsiderationsDesign Considerations
EarthworkEarthworkScheduling/timingScheduling/timingMoisture requirements and effectsMoisture requirements and effectsVegetative damage to inert structuresVegetative damage to inert structuresAuxiliary practices on severely eroded sitesAuxiliary practices on severely eroded sites–– GabionsGabions–– RiprapRiprap
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Wattles/FascinesWattles/Fascines
Long branch cuttings bound into sausageLong branch cuttings bound into sausage--shapedshapedbundles placed in a shallow trench to stabilize stream bundles placed in a shallow trench to stabilize stream banks and slopes.banks and slopes.
–– Dissipate energyDissipate energy–– Trap and hold soil on the bankTrap and hold soil on the bank–– Reduce long to series of short slopesReduce long to series of short slopes–– Immediate surface and rill erosion controlImmediate surface and rill erosion control–– Suited to steep rocky slopes where digging is difficultSuited to steep rocky slopes where digging is difficult–– Protect from shallow slides (1Protect from shallow slides (1--2 foot depth) on stabile slopes2 foot depth) on stabile slopes
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Installation GuidelinesInstallation Guidelines
Prepare wattles and live stakes immediately before installationPrepare wattles and live stakes immediately before installationStart at base of slopeStart at base of slopeDistance between trenches (wattles)Distance between trenches (wattles)SlopeSlope Distance Between Trenches (ft) Distance Between Trenches (ft) Maximum Slope Maximum Slope
Length (ft)Length (ft)1:1 1:1 -- 1.5:11.5:1 3 3 -- 4 4 15151.5:1 1.5:1 -- 2:12:1 4 4 -- 5 205 202:1 2:1 -- 2.5:12.5:1 5 5 -- 66 30302.5:1 2.5:1 –– 3:13:1 6 6 -- 88 40403.5:1 3.5:1 –– 4:14:1 8 8 -- 99 50504.5:1 4.5:1 –– 5:15:1 9 9 --1010 6060
Dig trenches 12 Dig trenches 12 --18 inches wide and 6 18 inches wide and 6 -- 8 deep 8 deep Stake in front and through wattle. Stake in front and through wattle. Drive live stakes on down slope side of bundleDrive live stakes on down slope side of bundleOverlap bundles 12 inches and stake between last two ties of bunOverlap bundles 12 inches and stake between last two ties of bundlesdles
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Brush Layering/Branch PackingBrush Layering/Branch Packing
Live branches placed more or less perpendicular to theLive branches placed more or less perpendicular to thecontour in small trenches excavated into new fills, shallow contour in small trenches excavated into new fills, shallow mass failures, deep and/or narrow gullies, holes in mass failures, deep and/or narrow gullies, holes in streambanksstreambanks
–– Trap debris on the slopeTrap debris on the slope–– Reinforce soil with unrooted branchesReinforce soil with unrooted branches–– Redirect seepage (act as horizontal drains)Redirect seepage (act as horizontal drains)–– Aid infiltration on dry sites and drying on wetAid infiltration on dry sites and drying on wet–– Provide stability and microclimate for vegetation establishmentProvide stability and microclimate for vegetation establishment–– Reduce long to series of short slopes separated by brush layersReduce long to series of short slopes separated by brush layers
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Installation GuidelinesInstallation GuidelinesStart at toe of slopeStart at toe of slopeExcavate horizontally on contour or slightly down slopeExcavate horizontally on contour or slightly down slopeDistance between Benches (Brush rows)Distance between Benches (Brush rows)SlopeSlope Distance Between Benches (ft) Distance Between Benches (ft) Maximum Slope Maximum Slope
Wet Slopes Wet Slopes Dry Slopes Length (ft)Dry Slopes Length (ft)2:1 2:1 -- 2.5:12.5:1 33 33 15152.5:1 2.5:1 -- 3:13:1 33 44 15153:1 3:1 -- 4:14:1 44 55 2020
Dig trenches 2Dig trenches 2--3 ft deep3 ft deepSlope bench so outside edge is higher than insideSlope bench so outside edge is higher than insideCrissCriss--cross branchescross branchesButt of branch in back of trench; tips exposed Butt of branch in back of trench; tips exposed Fill lower benches with soil removed from next liftFill lower benches with soil removed from next liftMulch/seed between lifts Mulch/seed between lifts Use mesh on slopes >3:1Use mesh on slopes >3:1
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Brush MattressBrush Mattress
Layer of dormant branches laid on and secured toLayer of dormant branches laid on and secured toa bank or slope surfacea bank or slope surface
–– Capture sedimentCapture sediment–– Provide an immediate, protective coverProvide an immediate, protective cover–– Work well along steep, fast moving streamsWork well along steep, fast moving streams–– Restore riparian vegetation and habitat rapidlyRestore riparian vegetation and habitat rapidly–– Establish conditions favorable for colonization by native plantsEstablish conditions favorable for colonization by native plants
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Installation GuidelinesInstallation GuidelinesGrade the area to be treatedGrade the area to be treatedTrench Trench –– 88--12 inches deep just below low water line 12 inches deep just below low water line –– flush to plane of slope faceflush to plane of slope face
Place brushPlace brush–– butt down in trench, butt down in trench, –– perpendicular to baseline perpendicular to baseline –– 22--4 inch layer of 6 4 inch layer of 6 --9 ft long cuttings when compressed9 ft long cuttings when compressed
Anchor by placing rock, wattle or log on top of buttsAnchor by placing rock, wattle or log on top of buttsStake and tieStake and tie–– 33--4 ft centers4 ft centers–– extend beyond sides of mat extend beyond sides of mat –– 1 ft above anchoring row to 1 ft below top of mat1 ft above anchoring row to 1 ft below top of mat–– tie between stakes with #12 wire or untreated twinetie between stakes with #12 wire or untreated twine–– drive stakes until no more than 4 inches above matdrive stakes until no more than 4 inches above mat
Fill space between branches with soilFill space between branches with soil
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StreambankStreambank Restoration ProjectsRestoration Projects
20022002Dolph CreekDolph CreekLake Poinsett Watershed ProjectLake Poinsett Watershed ProjectHamlin Conservation DistrictHamlin Conservation DistrictHamlin County, South DakotaHamlin County, South Dakota
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StreambankStreambank Restoration ProjectsRestoration Projects
2001 2001 -- 20022002Big Sioux RiverBig Sioux RiverUpper Big Sioux Watershed ProjectUpper Big Sioux Watershed ProjectCity of WatertownCity of WatertownCodington County, South DakotaCodington County, South Dakota
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StreambankStreambank Restoration ProjectsRestoration Projects
19981998Spring CreekSpring CreekPennington County, South DakotaPennington County, South Dakota
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StreambankStreambank Restoration ProjectsRestoration Projects
19971997Rapid CreekRapid CreekPennington County, South DakotaPennington County, South Dakota
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ReferencesReferencesA Soil Bioengineering Guide for Streambank and Lakeshore StabiliA Soil Bioengineering Guide for Streambank and Lakeshore StabilizationzationUSDA Forest Service. Eubanks and Meadows.USDA Forest Service. Eubanks and Meadows.
BioBio--Technology for Slope Protection and Erosion Control. Leiser 199Technology for Slope Protection and Erosion Control. Leiser 1998.8.
The Practical Streambank Bioengineering Guide The Practical Streambank Bioengineering Guide –– User’s Guide for Natural User’s Guide for Natural Streambank stabilization Techniques in the Arid and SemiStreambank stabilization Techniques in the Arid and Semi--Arid Great Basin Arid Great Basin and Intermountain West.and Intermountain West. Bentrup and Hoag 1998.Bentrup and Hoag 1998.
USDA NRCS Engineering Field Handbook (1996). USDA NRCS Engineering Field Handbook (1996). http://www.info.usda.gov/CED/ftp/CED/EFHhttp://www.info.usda.gov/CED/ftp/CED/EFH--Ch16.pdfCh16.pdf
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Questions?Questions?